Abstract
Most attention in studies of the mechanism of anionic polymerization has been given to the type of reactive centre present. The existing literature on the process, using epoxides, states that ionic pairs of alcoholate type play the main role [1]. The same applies also to ethylene oxide (EO) in tetrahydrofuran (THF) when alkali metal cations are present, with the one difference that the reactive centres associate to trimers in the range of large concentrations [2]. As the solvation of the ionic pair by this solvent plays a decisive part in all the transformations of the reactive centre, we attempted to find out the effects in other ether-type solvents having a solvating capacity differing from that of THF. We used for this purpose the dimethoxy-ethane (DME) and the dimethyl ether of diethylene glycol (DG). We also studied the conductivity of the “live” poly-EO in THF.
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